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5
Servicing
5.3.3
Checking or replacing the fan
Disconnect the system from the mains power supply.
Remove casing and ventilation cover.
Set multimeter to VAC.
Remove the 230 VAC plug (see fig. 63) from the fan.
Connect the multimeter to the blue and brown connections.
Connect the system to the mains power supply.
Check if there is 230 VAC on the connections when the
operating code "0C" appears in the display.
If necessary remove the UBA (see fig. 62) and set the
multimeter to measuring resistance. The resistance of
each pole should be 0 Ω.
Reconnect the cable.
If necessary measure the resistance over the tachoplug
(see fig. 64) in the same manner.
If the problem is still not solved then replace the fan.
Disconnect the plug from the gas valve (fig. 65, item 1).
Loosen the swivel nut (fig. 65, item 2)
Remove the suction tube (fig. 65, item 3).
Subject to modifications resulting from technical improvements!
48
Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 28C • 01/2004
fig. 63 Remove 230 VAC plug
fig. 64 Measure resistance of tachoplug
fig. 65 Remove suction tube
Boulter Buderus Ltd. • http://www.boulter-boilers.com
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